The radius of the disk is R, and the mass of the disk is M. Using the parallel axis theorem and theequation for the moment of inertia of a disk about its central axis developed in the previous example, Eq. (8), the moment of inertia of the disk about the specified axis is Fig.
Short Circuits. Short circuits are the second most common reason for breaker tripping and are a more serious concern. Short circuits occur when the black hot wires inside your electrical service panel come in contact with either other hot wires or neutral wires.
Battery School. When one amp of current passes through a circuit with zero ohms (the unit of measure for resistance) of resistance, no voltage drop occurs. Even when the circuit current increases to 200 amps through zero ohms, still no voltage drop occurs. The amount of resistance encountered by a current causes a voltage drop.